During the period of the Movement for Nation Protection, Sun Zhongshan insisted that the Northern area should be the center of the Movement with military activities being the major method.

But there have been some open problems about the historical facts of "The Defending Republicanism movement" and the appraisal of Tang Giyao as a chief leader of "The Defending Republicanism Movement".

After the republican revolution, the bourgeois revolution led by revolutionaries, protect the country and movement, have been the failure of law enforcement campaign also illustrates this point.